Carlos Miquel wrote an article (
here, behind a registration wall) where he explains why
he thinks that 2026
might be the final year for Fernando in F1.
It's just him reading in between the lines of some things Fernando has said recently, the most notable being that for a segment for Spanish tv where he was asked to "ask a question to 2026" (as in, the year), he said "I'd ask [it] if it's gonna be my final year." Carlos also mentions "some details that he can't make public", which I guess refers to the pregnancy.
He also says that Fernando told some friends in '23 that '24 would be his last season, then obviously changed his mind.
Additionally engine-wise, he said Mercedes are the only ones boasting about having solved their engine reliability issues.
He also posted his podcast, I'll listen to it tomorrow and post the more interesting bits here.